Positioning sine table

The utility model relates to a positioning sine table which comprises a base and a working table, an inclined plane is arranged on the left side of the bottom of the working table, the position, adjacent to the inclined plane, of the left side of the bottom is hinged to the left side of the upper surface of the base, a cylinder is connected to the right side of the bottom, and the axis of the cylinder and the hinged axis are parallel and located on the same horizontal plane. A circular through hole in the vertical direction is formed in the position, at the joint of the inclined face and the bottom face, of the bottom of the workbench, a spherical-crown-shaped groove with the height smaller than the radius of a sphere is formed in the left side of the position, hinged to the workbench, of the upper surface of the base, and a cylindrical supporting column is installed in the groove in a matched mode. One end of the supporting column is a spherical crown head which is matched with the groove in shape, is in a s